DS90CF364 Pin Description — FPD Link Receiver
Pin Name
RxIN+
RxIN−
RxOUT
RxCLK IN+
RxCLK IN−
FPSHIFT OUT
PWR DWN
V
CC
GND
PLL V
CC
PLL GND
LVDS V
CC
LVDS GND
I/O
I
I
O
I
I
O
I
I
I
I
I
I
I
No.
3
3
21
1
1
1
1
4
5
1
2
1
3
Positive LVDS differentiaI data inputs.
Negative LVDS differential data inputs.
TTL level data outputs. This includes: 6 Red, 6 Green, 6 Blue, and 3 control lines — FPLINE,
FPFRAME, DRDY (also referred to as HSYNC, VSYNC, Data Enable).
Positive LVDS differential clock input.
Negative LVDS differential clock input.
TTL Ievel clock output. The falling edge acts as data strobe. Pin name RxCLK OUT.
TTL level input. When asserted (low input) the receiver outputs are low.
Power supply pins for TTL outputs.
Ground pins for TTL outputs.
Power supply for PLL.
Ground pin for PLL.
Power supply pin for LVDS inputs.
Ground pins for LVDS inputs.
Description
Applications Information
The DS90C363 and DS90CF364 are backward compatible
with the existing 5V FPD Link transmitter/receiver pair
(DS90CF563 and DS90CF564). To upgrade from a 5V to a
3.3V system the following must be addressed:
Change 5V power supply to 3.3V. Provide this supply to
the V
CC
, LVDS V
CC
and PLL V
CC
of both the transmitter
and receiver devices. This change may enable the re-
moval of a 5V supply from the system, and power may
be supplied from an existing 3V power source.
2. The DS90C363 (transmitter) incorporates a rise/fall
strobe select pin. This select function is on pin 14, for-
merly a V
CC
connection on the 5V products. When the
rise/fall strobe select pin is connected to V
CC
, the part is
configured with a rising edge strobe. In a system cur-
rently using a 5V rising edge strobe transmitter
(DS90CR563), no layout changes are required to ac-
commodate the new rise/fall select pin on the 3.3V
transmitter. The V
CC
signal may remain at pin 14, and
the device will be configured with a rising edge strobe.
When converting from a 5V falling edge transmitter
(DS90CF563) to the 3V transmitter a minimal board
layout change is necessary.
The 3.3V transmitter will
not be configured with a falling edge strobe if V
CC
re-
mains connected to the select pin. To guarantee the
3.3V transmitter functions with a falling edge strobe pin
14 should be connected to ground OR left unconnected.
When not connected (left open) and internal pull-down
resistor ties pin 14 to ground, thus configuring the trans-
mitter with a falling edge strobe.
3. The DS90C363 transmitter input and control inputs ac-
cept 3.3V TTL/CMOS levels. They are not 5V tolerant.
1.
www.national.com
14
NSC [ NATIONAL SEMICONDUCTOR ]
